Mobile-terminated early data transmission

Abstract

A wireless device is configured for use in a wireless communication system. The wireless device is configured to transmit signaling indicating whether or not the wireless device is capable of receiving user data during a random access procedure. The signaling may for instance indicate whether or not the wireless device is capable of receiving user data over a user plane during a random access procedure, e.g., by indicating whether or not the wireless device supports early data for cellular internet of things, CIoT, Evolved Packet System, EPS, user plane (UP) optimization. Regardless, the wireless device may also receive user data during the random access procedure in accordance with said signaling.

What is claimed is: 
     
       1. A wireless device configured for use in a wireless communication system, the wireless device comprising:
 power supply circuitry configured to supply power to the wireless device; and 
 processing circuitry configured to transmit signaling, wherein the signaling indicates that the wireless device is capable of receiving user data during a random access procedure, wherein the signaling indicates that the wireless device is capable of receiving user data over a user plane during a random access procedure by indicating that the wireless device supports early data for cellular internet of things (CloT) Evolved Packet System (EPS) user plane (UP) optimization, wherein, according to early data for CloT EPS UP optimization, a Radio Resource Control (RRC) connection resume message of the random access procedure is multiplexed with downlink user data on a dedicated traffic channel. 
 
     
     
       2. The wireless device of  claim 1 , wherein the processing circuitry is configured to receive user data during the random access procedure in accordance with said signaling. 
     
     
       3. The wireless device of  claim 1 , wherein the processing circuitry is configured to, based on the signaling indicating that the wireless device is capable of receiving user data during the random access procedure, monitor for reception of user data during the random access procedure. 
     
     
       4. The wireless device of  claim 1 , wherein the processing circuitry is configured to transmit the signaling in a radio resource control, RRC, message. 
     
     
       5. The wireless device of  claim 1 , wherein the processing circuitry is configured to transmit the signaling to a base station in a radio resource control, RRC, message of the random access procedure, wherein the RRC message is a RRC connection request message or an RRC connection resume request message. 
     
     
       6. The wireless device of  claim 1 , wherein the processing circuitry is configured to transmit the signaling to a core network node in a core network of the wireless communication system during or upon an initial attach procedure for the wireless device to attach to the wireless communication system. 
     
     
       7. The wireless device of  claim 1 , wherein the processing circuitry is configured to select a random access preamble for the random access procedure from among a set of possible random access preambles that is agnostic as to whether or not the wireless device is capable of receiving user data during the random access procedure, and transmit the selected random access preamble during the random access procedure. 
     
     
       8. The wireless device of  claim 7 , wherein the signaling indicates separate capabilities regarding support for receiving user data over a control plane during the random access procedure and support for receiving user data over a user plane during the random access procedure. 
     
     
       9. The wireless device of  claim 1 , wherein the processing circuitry is configured to, during the random access procedure, transmit a radio resource control, RRC, message that excludes any uplink user data, wherein the RRC message is an RRC connection resume request message or an RRC connection request message. 
     
     
       10. The wireless device of  claim 1 , wherein the wireless device is a narrowband internet-of-thing, NB-IOT, device or an enhanced machine type communication, eMTC, device. 
     
     
       11. The wireless device of  claim 1 , wherein the signaling indicates that the wireless device is capable of receiving user data over a user plane during a random access procedure. 
     
     
       12. A network node configured for use in a wireless communication system, the network node comprising:
 power supply circuitry configured to supply power to the network node; and 
 processing circuitry configured to receive signaling, wherein the signaling indicates that a wireless device is capable of receiving user data during a random access procedure, wherein the signaling indicates that the wireless device is capable of receiving user data over a user plane during a random access procedure by indicating that the wireless device supports early data for cellular internet of things (CloT) Evolved Packet System (EPS) user plane (UP) optimization, wherein, according to early data for CloT EPS UP optimization, a Radio Resource Control (RRC) connection resume message of the random access procedure is multiplexed with downlink user data on a dedicated traffic channel. 
 
     
     
       13. The network node of  claim 12 , wherein the network node is a radio network node, and wherein the processing circuitry is further configured to, responsive to the signaling indicating that the wireless device is capable of receiving user data during a random access procedure, transmit user data to the wireless device during a random access procedure. 
     
     
       14. The network node of  claim 12 , wherein the processing circuitry is configured receive the signalling from the wireless device in a radio resource control (RRC) message. 
     
     
       15. The network node of  claim 12 , wherein the processing circuitry is configured to receive the signaling from the wireless device in a radio resource control (RRC) message of the random access procedure, wherein the RRC message is a RRC connection request message or an RRC connection resume request message. 
     
     
       16. The network node of  claim 12 , wherein the network node is a radio network node, and wherein the processing circuitry is configured to receive the signaling from a core network node in a core network of the wireless communication system. 
     
     
       17. The network node of  claim 12 , wherein the network node is a radio network node, and wherein the processing circuitry is further configured to, during the random access procedure, receive from the wireless device a radio resource control (RRC) message that excludes any uplink user data, wherein the RRC message is an RRC connection resume request message or an RRC connection request message. 
     
     
       18. The network node of  claim 12 , wherein the wireless device is a narrowband internet-of-thing, NB-IOT, device or an enhanced machine type communication, eMTC, device. 
     
     
       19. The network node of  claim 12 , wherein the signaling indicates that the wireless device is capable of receiving user data over a user plane during a random access procedure. 
     
     
       20. The network node of  claim 12 , wherein the signaling indicates separate capabilities regarding support for receiving user data over a control plane during the random access procedure and support for receiving user data over a user plane during the random access procedure. 
     
     
       21. A core network node configured for use in a wireless communication system, the core network node comprising:
 power supply circuitry configured to supply power to the core network node; and 
 processing circuitry configured to transmit signaling to a radio network node, wherein the signaling indicates that a wireless device is capable of receiving user data during a random access procedure, wherein the signaling indicates that the wireless device is capable of receiving user data over a user plane during a random access procedure by indicating that the wireless device supports early data for cellular internet of things (CloT) Evolved Packet System (EPS) user plane (UP) optimization, wherein, according to early data for CloT EPS UP optimization, a Radio Resource Control (RRC) connection resume message of the random access procedure is multiplexed with downlink user data on a dedicated traffic channel. 
 
     
     
       22. The core network node of  claim 21 , wherein the signaling indicates separate capabilities regarding support for receiving user data over a control plane during the random access procedure and support for receiving user data over a user plane during the random access procedure.